Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Charged Soft Matter

CPP 19.6: Vortrag

Mittwoch, 28. März 2012, 10:45–11:00, C 243

Enhanced charge transport in nano-confined ionic liquids — •Ciprian Ghiorghita Iacob, Joshua Sangoro, Wycliffe Kipnusu, Rustem Valiullin, Jörg Kärger, and Friedrich Kremer — Institute of Experimental Physics I, University of Leipzig, Leipzig, Germany

Charge transport in ionic liquids contained in unidirectional nanoporous membranes (pore diameters: 7.5-10.4 nm) is investigated by combining Broadband Dielectric Spectroscopy (BDS) and Pulsed Field Gradient (PFG)-NMR [1-3]. This enables one to determine the diffusion coefficient and the diffusion rate over more than 13 decades and to trace its temperature dependence [4, 5]. Under conditions of nanometric confinement, a change from a Vogel-Fulcher-Tammann into an Arrhenius-like thermal activation is observed, resulting in an enhancement of diffusivities by more than two orders of magnitude. The effect becomes more pronounced with decreasing pore diameter. It is attributed to changes in molecular packing and hence in density leading to higher mobility and electrical conductivity.

References 1. Iacob, C.et al., Phys. Chem. Chem. Phys.,12(41): p. 13798-13803,2010. 2. Iacob, C.et al., Soft Matter, 2011. 3. Kremer, F., Schönhals, A.,Berlin: Springer,2003. 4. Sangoro, J.R. and Kremer, F.,Accounts of Chemical Research, 2011. 5. Sangoro, J.R., et al. Soft Matter, 7(5): p. 1678-1681, 2011.